Car won't start. Changed fuel injector, fuel line, distributor cap & module & wires, sparks changed too HELP?

I started having trouble starting my truck a few months ago and it would take about 5 or more turns of the key to get it started once it did start I didn't have any problems about a month ago I had taken it to a shop and they told me it was my fuel injector so I got that replaced and fuel lines also. It still did the same thing, It ran a little smoother but still hard to turn over after sitting a while, anyway I was driving it yesterday and stopped at about 5 places and the last stop it didn't want to turn over even after running a while I sat for about 10 minutes and it eventually turned over, I parked it in the garage and decided to change the distributor, rotor, %26amp; wire's, the spark plugs were changed in the summer, After doing all that it still won't start at ALL. I had a friend to check the gas valve on top and it shot out when he pressed the value when turning the key, he says he thinks my timing is out, What do you think and how can I check that to see if it really is the timing?Car won't start. Changed fuel injector, fuel line, distributor cap %26amp; module %26amp; wires, sparks changed too HELP?Fuel pump.Car won't start. Changed fuel injector, fuel line, distributor cap %26amp; module %26amp; wires, sparks changed too HELP?If you haven't already, have your electrical and charging system checked thoroughly, including the belt that runs the alternator. Believe it or not, you may have spent an awful lot of money to replace parts that weren't bad simply because no one bothered to make sure the truck had enough power to start.Car won't start. Changed fuel injector, fuel line, distributor cap %26amp; module %26amp; wires, sparks changed too HELP?ya probly timing. cant check that if it dont run unless u play around with timing adjustment and see if it starts. then u know it is. or a bad starter too if u say it dont turn over.Car won't start. Changed fuel injector, fuel line, distributor cap %26amp; module %26amp; wires, sparks changed too HELP?Did you check the fuel pump if so then check to see if your timing chain jumped one link. Good luck.Car won't start. Changed fuel injector, fuel line, distributor cap %26amp; module %26amp; wires, sparks changed too HELP?Year and make would be nice.